When you are using the Insert Room tools you can dynamically change the size of the room you are inserting by changing the Width and Length parameters in the Inspector bar, or by using the local menu to access the tools properties.
You can find any tool by the Menu Structure HERE: https://turbocaddoc.atlassian.net/wiki/display/TC20UG/Menu+Structure
You can find the menu location of any tool by name HERE: https://turbocaddoc.atlassian.net/wiki/display/TC20UG/Tools+Mapped+to+Menus
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